condition mean min max ZT0-3 10.364885000000001 9.700520000000001 11.029250000000001 ZT4-7 6.4531600000000005 6.4531600000000005 6.4531600000000005 ZT8-11 5.514695 5.514695 5.514695 ZT12-15 0 0 0 ZT16-19 8.424665000000001 8.424665000000001 8.424665000000001 ZT20-23 7.745385000000001 7.745385000000001 7.745385000000001